these 2 derivations will be built:
  /nix/store/hmvqc59gl7017hjdpagxn4gq9xps4zvl-nixos-test-driver-pg_jsonschema.drv
  /nix/store/13pjrw9z5971l9civh92g6ypl4va608s-vm-test-run-pg_jsonschema.drv